178 lines
4.1 KiB
C
178 lines
4.1 KiB
C
/* $Id$ */
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/*
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* Copyright (C) 2003-2007 Benny Prijono <benny@prijono.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <pjmedia/config.h>
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#include <pjmedia/echo.h>
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#include <pj/assert.h>
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#include <pj/pool.h>
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#include "echo_internal.h"
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typedef struct ec_operations ec_operations;
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struct pjmedia_echo_state
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{
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void *state;
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ec_operations *op;
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};
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struct ec_operations
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{
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pj_status_t (*ec_create)(pj_pool_t *pool,
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unsigned clock_rate,
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unsigned samples_per_frame,
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unsigned tail_ms,
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unsigned latency_ms,
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unsigned options,
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void **p_state );
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pj_status_t (*ec_destroy)(void *state );
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pj_status_t (*ec_playback)(void *state,
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pj_int16_t *play_frm );
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pj_status_t (*ec_capture)(void *state,
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pj_int16_t *rec_frm,
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unsigned options );
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pj_status_t (*ec_cancel)(void *state,
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pj_int16_t *rec_frm,
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const pj_int16_t *play_frm,
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unsigned options,
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void *reserved );
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};
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static struct ec_operations echo_supp_op =
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{
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&echo_supp_create,
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&echo_supp_destroy,
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&echo_supp_playback,
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&echo_supp_capture,
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&echo_supp_cancel_echo
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};
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/*
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* Speex AEC prototypes
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*/
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#if defined(PJMEDIA_HAS_SPEEX_AEC) && PJMEDIA_HAS_SPEEX_AEC!=0
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static struct ec_operations aec_op =
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{
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&speex_aec_create,
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&speex_aec_destroy,
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&speex_aec_playback,
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&speex_aec_capture,
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&speex_aec_cancel_echo
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};
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#else
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#define aec_op echo_supp_op
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#endif
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/*
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* Create the echo canceller.
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*/
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PJ_DEF(pj_status_t) pjmedia_echo_create( pj_pool_t *pool,
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unsigned clock_rate,
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unsigned samples_per_frame,
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unsigned tail_ms,
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unsigned latency_ms,
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unsigned options,
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pjmedia_echo_state **p_echo )
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{
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pjmedia_echo_state *ec;
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pj_status_t status;
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/* Force to use simple echo suppressor if AEC is not available */
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#if !defined(PJMEDIA_HAS_SPEEX_AEC) || PJMEDIA_HAS_SPEEX_AEC==0
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options |= PJMEDIA_ECHO_SIMPLE;
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#endif
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ec = PJ_POOL_ZALLOC_T(pool, struct pjmedia_echo_state);
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if (options & PJMEDIA_ECHO_SIMPLE) {
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ec->op = &echo_supp_op;
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status = (*echo_supp_op.ec_create)(pool, clock_rate, samples_per_frame,
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tail_ms, latency_ms, options,
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&ec->state);
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} else {
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ec->op = &aec_op;
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status = (*aec_op.ec_create)(pool, clock_rate,
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samples_per_frame,
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tail_ms, latency_ms, options,
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&ec->state);
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}
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if (status != PJ_SUCCESS)
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return status;
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pj_assert(ec->state != NULL);
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*p_echo = ec;
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return PJ_SUCCESS;
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}
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/*
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* Destroy the Echo Canceller.
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*/
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PJ_DEF(pj_status_t) pjmedia_echo_destroy(pjmedia_echo_state *echo )
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{
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return (*echo->op->ec_destroy)(echo->state);
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}
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/*
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* Let the Echo Canceller knows that a frame has been played to the speaker.
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*/
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PJ_DEF(pj_status_t) pjmedia_echo_playback( pjmedia_echo_state *echo,
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pj_int16_t *play_frm )
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{
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return (*echo->op->ec_playback)(echo->state, play_frm);
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}
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/*
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* Let the Echo Canceller knows that a frame has been captured from
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* the microphone.
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*/
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PJ_DEF(pj_status_t) pjmedia_echo_capture( pjmedia_echo_state *echo,
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pj_int16_t *rec_frm,
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unsigned options )
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{
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return (*echo->op->ec_capture)(echo->state, rec_frm, options);
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}
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/*
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* Perform echo cancellation.
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*/
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PJ_DEF(pj_status_t) pjmedia_echo_cancel( pjmedia_echo_state *echo,
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pj_int16_t *rec_frm,
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const pj_int16_t *play_frm,
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unsigned options,
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void *reserved )
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{
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return (*echo->op->ec_cancel)( echo->state, rec_frm, play_frm, options,
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reserved);
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}
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